i2c: designware_i2c: Prepare for DM driver conversion

This patch prepares the designware I2C driver for the DM conversion.
This is mainly done by removing struct i2c_adapter from the functions
that shall be used by the DM driver version as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>

drivers/i2c/designware_i2c.c

@@ -10,30 +10,6 @@
 #include <asm/io.h>
 #include "designware_i2c.h"
 
-static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
-{
-	switch (adap->hwadapnr) {
-#if CONFIG_SYS_I2C_BUS_MAX >= 4
-	case 3:
-		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE3;
-#endif
-#if CONFIG_SYS_I2C_BUS_MAX >= 3
-	case 2:
-		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE2;
-#endif
-#if CONFIG_SYS_I2C_BUS_MAX >= 2
-	case 1:
-		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE1;
-#endif
-	case 0:
-		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
-	default:
-		printf("Wrong I2C-adapter number %d\n", adap->hwadapnr);
-	}
-
-	return NULL;
-}
-
 static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
 {
 	u32 ena = enable ? IC_ENABLE_0B : 0;
@@ -61,10 +37,9 @@ static void dw_i2c_enable(struct i2c_regs *i2c_base, bool enable)
  *
  * Set the i2c speed.
  */
-static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap,
-					 unsigned int speed)
+static unsigned int __dw_i2c_set_bus_speed(struct i2c_regs *i2c_base,
+					   unsigned int speed)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	unsigned int cntl;
 	unsigned int hcnt, lcnt;
 	int i2c_spd;
@@ -113,47 +88,17 @@ static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap,
 	/* Enable back i2c now speed set */
 	dw_i2c_enable(i2c_base, true);
 
-	adap->speed = speed;
-
 	return 0;
 }
 
-/*
- * i2c_init - Init function
- * @speed:	required i2c speed
- * @slaveaddr:	slave address for the device
- *
- * Initialization function.
- */
-static void dw_i2c_init(struct i2c_adapter *adap, int speed,
-			int slaveaddr)
-{
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
-
-	/* Disable i2c */
-	dw_i2c_enable(i2c_base, false);
-
-	writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_base->ic_con);
-	writel(IC_RX_TL, &i2c_base->ic_rx_tl);
-	writel(IC_TX_TL, &i2c_base->ic_tx_tl);
-	dw_i2c_set_bus_speed(adap, speed);
-	writel(IC_STOP_DET, &i2c_base->ic_intr_mask);
-	writel(slaveaddr, &i2c_base->ic_sar);
-
-	/* Enable i2c */
-	dw_i2c_enable(i2c_base, true);
-}
-
 /*
  * i2c_setaddress - Sets the target slave address
  * @i2c_addr:	target i2c address
  *
  * Sets the target slave address.
  */
-static void i2c_setaddress(struct i2c_adapter *adap, unsigned int i2c_addr)
+static void i2c_setaddress(struct i2c_regs *i2c_base, unsigned int i2c_addr)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
-
 	/* Disable i2c */
 	dw_i2c_enable(i2c_base, false);
 
@@ -168,10 +113,8 @@ static void i2c_setaddress(struct i2c_adapter *adap, unsigned int i2c_addr)
  *
  * Flushes the i2c RX FIFO
  */
-static void i2c_flush_rxfifo(struct i2c_adapter *adap)
+static void i2c_flush_rxfifo(struct i2c_regs *i2c_base)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
-
 	while (readl(&i2c_base->ic_status) & IC_STATUS_RFNE)
 		readl(&i2c_base->ic_cmd_data);
 }
@@ -181,9 +124,8 @@ static void i2c_flush_rxfifo(struct i2c_adapter *adap)
  *
  * Waits for bus busy
  */
-static int i2c_wait_for_bb(struct i2c_adapter *adap)
+static int i2c_wait_for_bb(struct i2c_regs *i2c_base)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	unsigned long start_time_bb = get_timer(0);
 
 	while ((readl(&i2c_base->ic_status) & IC_STATUS_MA) ||
@@ -197,15 +139,13 @@ static int i2c_wait_for_bb(struct i2c_adapter *adap)
 	return 0;
 }
 
-static int i2c_xfer_init(struct i2c_adapter *adap, uchar chip, uint addr,
+static int i2c_xfer_init(struct i2c_regs *i2c_base, uchar chip, uint addr,
 			 int alen)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
-
-	if (i2c_wait_for_bb(adap))
+	if (i2c_wait_for_bb(i2c_base))
 		return 1;
 
-	i2c_setaddress(adap, chip);
+	i2c_setaddress(i2c_base, chip);
 	while (alen) {
 		alen--;
 		/* high byte address going out first */
@@ -215,9 +155,8 @@ static int i2c_xfer_init(struct i2c_adapter *adap, uchar chip, uint addr,
 	return 0;
 }
 
-static int i2c_xfer_finish(struct i2c_adapter *adap)
+static int i2c_xfer_finish(struct i2c_regs *i2c_base)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	ulong start_stop_det = get_timer(0);
 
 	while (1) {
@@ -229,12 +168,12 @@ static int i2c_xfer_finish(struct i2c_adapter *adap)
 		}
 	}
 
-	if (i2c_wait_for_bb(adap)) {
+	if (i2c_wait_for_bb(i2c_base)) {
 		printf("Timed out waiting for bus\n");
 		return 1;
 	}
 
-	i2c_flush_rxfifo(adap);
+	i2c_flush_rxfifo(i2c_base);
 
 	return 0;
 }
@@ -249,10 +188,9 @@ static int i2c_xfer_finish(struct i2c_adapter *adap)
  *
  * Read from i2c memory.
  */
-static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
-		       int alen, u8 *buffer, int len)
+static int __dw_i2c_read(struct i2c_regs *i2c_base, u8 dev, uint addr,
+			 int alen, u8 *buffer, int len)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	unsigned long start_time_rx;
 
 #ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
@@ -274,7 +212,7 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
 	      addr);
 #endif
 
-	if (i2c_xfer_init(adap, dev, addr, alen))
+	if (i2c_xfer_init(i2c_base, dev, addr, alen))
 		return 1;
 
 	start_time_rx = get_timer(0);
@@ -294,7 +232,7 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
 		}
 	}
 
-	return i2c_xfer_finish(adap);
+	return i2c_xfer_finish(i2c_base);
 }
 
 /*
@@ -307,10 +245,9 @@ static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
  *
  * Write to i2c memory.
  */
-static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
-			int alen, u8 *buffer, int len)
+static int __dw_i2c_write(struct i2c_regs *i2c_base, u8 dev, uint addr,
+			  int alen, u8 *buffer, int len)
 {
-	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	int nb = len;
 	unsigned long start_time_tx;
 
@@ -333,7 +270,7 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 	      addr);
 #endif
 
-	if (i2c_xfer_init(adap, dev, addr, alen))
+	if (i2c_xfer_init(i2c_base, dev, addr, alen))
 		return 1;
 
 	start_time_tx = get_timer(0);
@@ -354,7 +291,76 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
 		}
 	}
 
-	return i2c_xfer_finish(adap);
+	return i2c_xfer_finish(i2c_base);
+}
+
+static struct i2c_regs *i2c_get_base(struct i2c_adapter *adap)
+{
+	switch (adap->hwadapnr) {
+#if CONFIG_SYS_I2C_BUS_MAX >= 4
+	case 3:
+		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE3;
+#endif
+#if CONFIG_SYS_I2C_BUS_MAX >= 3
+	case 2:
+		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE2;
+#endif
+#if CONFIG_SYS_I2C_BUS_MAX >= 2
+	case 1:
+		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE1;
+#endif
+	case 0:
+		return (struct i2c_regs *)CONFIG_SYS_I2C_BASE;
+	default:
+		printf("Wrong I2C-adapter number %d\n", adap->hwadapnr);
+	}
+
+	return NULL;
+}
+
+static unsigned int dw_i2c_set_bus_speed(struct i2c_adapter *adap,
+					 unsigned int speed)
+{
+	adap->speed = speed;
+	return __dw_i2c_set_bus_speed(i2c_get_base(adap), speed);
+}
+
+/*
+ * i2c_init - Init function
+ * @speed:	required i2c speed
+ * @slaveaddr:	slave address for the device
+ *
+ * Initialization function.
+ */
+static void dw_i2c_init(struct i2c_adapter *adap, int speed,
+			int slaveaddr)
+{
+	struct i2c_regs *i2c_base = i2c_get_base(adap);
+
+	/* Disable i2c */
+	dw_i2c_enable(i2c_base, false);
+
+	writel((IC_CON_SD | IC_CON_SPD_FS | IC_CON_MM), &i2c_base->ic_con);
+	writel(IC_RX_TL, &i2c_base->ic_rx_tl);
+	writel(IC_TX_TL, &i2c_base->ic_tx_tl);
+	dw_i2c_set_bus_speed(adap, speed);
+	writel(IC_STOP_DET, &i2c_base->ic_intr_mask);
+	writel(slaveaddr, &i2c_base->ic_sar);
+
+	/* Enable i2c */
+	dw_i2c_enable(i2c_base, true);
+}
+
+static int dw_i2c_read(struct i2c_adapter *adap, u8 dev, uint addr,
+		       int alen, u8 *buffer, int len)
+{
+	return __dw_i2c_read(i2c_get_base(adap), dev, addr, alen, buffer, len);
+}
+
+static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
+			int alen, u8 *buffer, int len)
+{
+	return __dw_i2c_write(i2c_get_base(adap), dev, addr, alen, buffer, len);
 }
 
 /*
@@ -362,13 +368,14 @@ static int dw_i2c_write(struct i2c_adapter *adap, u8 dev, uint addr,
  */
 static int dw_i2c_probe(struct i2c_adapter *adap, u8 dev)
 {
+	struct i2c_regs *i2c_base = i2c_get_base(adap);
 	u32 tmp;
 	int ret;
 
 	/*
 	 * Try to read the first location of the chip.
 	 */
-	ret = dw_i2c_read(adap, dev, 0, 1, (uchar *)&tmp, 1);
+	ret = __dw_i2c_read(i2c_base, dev, 0, 1, (uchar *)&tmp, 1);
 	if (ret)
 		dw_i2c_init(adap, adap->speed, adap->slaveaddr);